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Research Papers: Thermal Systems

Heat Transfer During Compression and Expansion of Gas

[+] Author and Article Information
Masutaka Ota

Department of Mechanical Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japan

Yoshihiko Haramura

Department of Mechanical Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama, Kanagawa 221-8686, Japanharamura@mech.kanagawa-u.ac.jp

J. Heat Transfer 130(3), 032801 (Mar 05, 2008) (6 pages) doi:10.1115/1.2804949 History: Received November 21, 2006; Revised June 09, 2007; Published March 05, 2008

Heat transfer during compression and expansion of gas is investigated to obtain a correlation that is easy to use in the design of the reciprocating energy conversion machines. We carried out experiments to measure the heat transfer characteristics to̸from gas during compression and expansion to obtain the correlation. These measurements were performed using a piston-cylinder assembly over a range of volume ratios, frequencies, mean pressures, gases, and internal extended surface areas. The heat transfer was estimated thermodynamically from experimental pressure-volume data. Dimensionless groups for heat transfer are discussed in order to correlate the data. The product of the dimensionless heat transfer and specific heat ratio was found to be optimal and was correlated with only the Peclet number for a wide range of conditions, even for gases having different specific heat ratios. The temperature amplitude of the center of the test space was obtained, and it is found that the penetration depth reached the center when the Peclet number is in the range from 20 to 30.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Extended surface with 4mm interval

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Figure 3

Example of δQ∕dθ

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Figure 4

Pressure-volume diagram for helium and compression ratio of 1.1 (log-log plot)

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Figure 5

Dimensionless heat transfer as a function of the Peclet number

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Figure 6

Ta,center∕Ta,adia as a function of the Peclet number

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Figure 7

Complex Nusselt number for helium and argon for volume ratio of 1.1

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Figure 8

Phase lead of heat flux against volume change

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